An IntoResponse-based result type that uses ErrorResponse as the error type.

All types which implement IntoResponse can be converted to an ErrorResponse. This makes it useful as a general purpose error type for functions which combine multiple distinct error types that all implement IntoResponse.

Example

use axum::{
    response::{IntoResponse, Response},
    http::StatusCode,
};

// two fallible functions with different error types
fn try_something() -> Result<(), ErrorA> {
    // ...
    # unimplemented!()
}

fn try_something_else() -> Result<(), ErrorB> {
    // ...
    # unimplemented!()
}

// each error type implements `IntoResponse`
struct ErrorA;

impl IntoResponse for ErrorA {
    fn into_response(self) -> Response {
        // ...
        # unimplemented!()
    }
}

enum ErrorB {
    SomethingWentWrong,
}

impl IntoResponse for ErrorB {
    fn into_response(self) -> Response {
        // ...
        # unimplemented!()
    }
}

// we can combine them using `axum::response::Result` and still use `?`
async fn handler() -> axum::response::Result<&'static str> {
    // the errors are automatically converted to `ErrorResponse`
    try_something()?;
    try_something_else()?;

    Ok("it worked!")
}

As a replacement for std::result::Result

Since axum::response::Result has a default error type you only have to specify the Ok type:

use axum::{
    response::{IntoResponse, Response, Result},
    http::StatusCode,
};

// `Result<T>` automatically uses `ErrorResponse` as the error type.
async fn handler() -> Result<&'static str> {
    try_something()?;

    Ok("it worked!")
}

// You can still specify the error even if you've imported `axum::response::Result`
fn try_something() -> Result<(), StatusCode> {
    // ...
    # unimplemented!()
}